The perpetuation of the hoax :

the “hockey stick” deception – Al Gore

 

The Great “Hockey Stick” Fraud

In 2006 Al Gore presented his famous “hockey stick” graph, supposedly demonstrating how man was fuelling “global warming”.  This deception has now been exposed by several scientists including Steve McIntyre, Andrew Montford and Christopher Booker.

​https://www.prospectmagazine.co.uk/magazine/the-case-against-the-hockey-stick

 

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Exposed hockey stick lies

“Given star billing by the IPCC, not least for the way it appeared to eliminate the long-accepted Mediaeval Warm Period when temperatures were higher they are today, the graph became the central icon of the entire man-made global warming movement”.

http://www.telegraph.co.uk/comment/columnists/christopherbooker/6679082/Climate-change-this-is-the-worst-scientific-scandal-of-our-generation.html

 

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But Didn’t the “Hockey Stick” Show

Recent Warming to be Unprecedented?

The “hockey Stick” reconstructions of temperature variations over the last 1 to 2 thousand years have been a huge source of controversy. The hockey stick was previously used by the IPCC as a veritable poster child for anthropogenic warming, since it seemed to indicate there have been no substantial temperature changes over the last 1,000 to 2,000 years until humans got involved in the 20th Century. The various versions of the hockey stick were based upon limited amounts of temperature proxy evidence — primarily tree rings — and involved questionable statistical methods. In contrast, I think the bulk of the proxy evidence supports the view that it was at least as warm during the Medieval Warm Period, around 1000 AD. The very fact that recent tree ring data erroneously suggests cooling in the last 50 years, when in fact there has been warming, should be a warning flag about using tree ring data for figuring out how warm it was 1,000 years ago. But without actual thermometer data, we will never know for sure”.

http://www.drroyspencer.com/my-global-warming-skepticism-for-dummies/